Optical transfer is clearer when several fraction products are visible. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Two half stages leave one quarter
Source 24 through transfers 1/2 and 1/2 leaves output 6.
24⋅21⋅21=6
Mixed fractions can return an integer output
Source 24 through transfers 3/4 and 2/3 leaves output 12.
24⋅43⋅32=12
Factor cancellation still comes from multiplication
Source 30 through transfers 5/6 and 3/5 leaves output 15.